Pump.



P. H. DUHUP.

PUMP.

APPLICATIQN FILED MMLZ, |915.

Patented Mar. 6, 1,917.

ma Nonms PE rens zu.4 Nom umu wAaumnmN. D cv PAUL 1i. DURUP, orpisosroiv, MASSACHUSETTS.

- PUMP.

Application filed Mar-(m2, 1915. Serial No. 11,454.

ysubject of the King of Denmark, and resident of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pumps, of which the following is a specilication. Y

The present invention relates to pumps and other machines of Similar structure. The objects of the invention areto provide such a machine which embodies all the advantages of a double acting pump or motor and combines therewith the added advantages of great compactness and efficiency. Without intending to limit my invention I will state that the object which I have had particularly in view has been to produce an air pump suitable for attachment to automobiles to be driven by the motor of the automobile for pumping air into the tires, and in the following description of the herein illustrated embodiment of the invention I will designate the same as a pump.

In the drawings which form a part of this application Figure 1 is a sectional view on a plane including thecrank shaft and the axis of the cylinder of my novel pump. Fig. 2 is a sectional view on a plane including the axis of the cylinder and perpendicular to the crank shaft of the pump. Fig. 3 is Van elevation of the pump. Fig. 4 is a cross section on line 4-4 of Fig. 2 looking downward.

case 10, a cylinder 11 having a head 12 at of a wrist pin 22 which passes through bear'A ings in the eccentricprods 23, 24 which are engaged with, and operatedin any usual or desired way by, eccentrics 26 and 27 on the shaft 14. f

The principal novel feature of the invention consists in the arrangement of the piS- ton and the two cylinder heads by which the pump is made double acting, and the mode of mounting the inner cylinder `head 'by which the pump is made compact. The in- Speccation of Letters Patent.

The casing of the pump comprisesa crank Patented Mar. e, i917.

ner cylinder head is shown'at 28. It isen.-

tirely within the cylindrical outer casing 11 and also within the piston trunk 21, having a sliding bearing with a close fit upon the inner surface of such" trunk. The bearing'4` between the inner head and theinterior of the trunk maybe easily packed tightlyA enough by means ofk packing rings in a groove 29 on the outer cylindrical face 'of the head, in the same Way that many pump and engine pistons are packed. The piston is provided with a groove 30 adapted to conl tain packing rings t0 prevent leakage between its outer surface and the outer cylindrical casing. For supporting and holding the inner head inplace I provide a frame l consisting of side'members 31 and 32 and a ,bottom cross member 33. The latter rests upon a web 34 in the middle of the crank case and is shaped to overlie the shaft 14 and provide a box for the bearing 16, which is provided on the upper end of theweb 34. Lugs 35 and 36 on the under side of the cross piece 33 project into notches in the upper part of the web 34, and such lugs are retained in yplace by bolts 37 and 38 which pass through them `from'the outer. sides of the crank case and are contained in passages in the thickened upper part'of the web 34 as bestd'shown in Fig. 2. Preferably the head 28, side members 31 and32 and the bottom member 33 are all made as one integral casting, although I-'do not limit the details of construction of or the method `of making the same in any respect. The above described mode of securing the head 28 keeps it in its required relation'to theV piston, making any displacement impossible. l

The uprights 31 and 32 also provide channels for the intake and exhaust of air in the chamber 39 between the piston and-inner head 28. The passageway 4O1runs through the member 31 from the chamber 39 to a nipple 41 which passes out through the sides of the outer casing, Jandin which there is an inwardly opening check valve 42, the seat for which is formed in a thimble 43 which is screwed into the open lend ofthis nipple.

The exhaust passage 44visformed in the upright 32 and extends through a nipple 45 ico leading out from the uprightthrough the crankl case. This nipple 45 is formed with a valve seat 46 and contains an outwardly opening check valve 47 .The intake for thel chamber48 between the piston and the outer cylinder head is u p ump.

formed by one or more passages inv a thinible 49 which KVis threaded into a :nipplevO on the outer head, and in whichthere is an inwardly opening check'- valve 5i; *The exhaust from chamber 48 is through a port 52 in the side of this chamber controlled by Y an outwardly opening check valve 53 and thence'tlirough a`r passage 54 iii the outer cylinder wall, which passage opens into a sideport in the nipple 45. Said nipple is threaded so .as to receive a coupling V55 to which a vhose or other conduit maybe con# nected. Thel operation as to require no description.

of the pump is so obvious It `may be pointed out, however, thatk Vmy improvedy construction provides air chambers on` oppo" site sides "ofthe piston in whichalternately air vis admitted land compressed. The' exhaust from vboth chambers leads'to the same" coupling. small sizes and is adapted vtor use'as 'an automobile tire pump and adapted to be Such a pump may lbe madein' permanently or 'detachably connected with" the motor ot an automobile.

rEhe arrange-'f ment of the sinner cylinder head'within Vthe piston trunk is of high abling me toimake the engine compact, par'- ticularly of short:cylinder length and with sm'all clearance between 4the Ypiston lheadv and both cylinder heads, without sacriiicing length oit-stroke and at the "saine time retaining the double acting feature. `Eoth chambers of the ,cylinder are-"at Vthe same side of the crank shaft, and yet there is nov` piston rod, and 'neither is the vcrank case made a part offene of the Vchambers 'of the The 'particular construction of the parts advantage in enthepu'mp allows Vthe sameto be'readilyf` assembled and Vtaken apart'. rlheV 'ring 13? pump by sim#V ply Aremoving'the crank case and'attaching to tlie're'inaiiiing'parts duplicates of'such` parts," (outer casing,`piston, andinner'head 'f With its supporting frame) *arranged in in` verted order andi'n axial alinemen't.V

Nhat l claim' and desire tosecure by Letters Patent is:` A l; fr-ivdouble actin-g pump comprising an bearings, an'outer cyli'nc' posite end of said connecting rod, an inner head fitting the interior of the piston trunk, a base on which saidcrank shaft is supported', and 'supports'for said inner headl arranged on opposite 'sides of the axis of said wrist pin and mounted on said base;

the chambers between the inner and outer head and the'piston having ports for admission and exhaust Vof iuid. Y

2. A double acting pump comprising a cylinder having a 'head-Fand*inletaiidexliaust vports adjacent to said head, automatic checlkvalves controlling said ports, trunk piston itting said cylinder with; its trunkl extendingaway "from tliecylinder head, a

lixed cylinder head fitting'fwithin the vtrunk of' the 'pistonat theopposite side ofthe piston from the first cylinder' head and havingV admission and exhaust npoi-ts opening into the sp ace within the trunk :piston between the 'head' of the latter and said ix'ed4 'cylinder head, and yautomaticcheck valves arranged to 'control' flow 'through said ports.

3. A: -double `acting l'pump coiiip'rising a cylinder having inlet and" exhaust means and ahead, a trunk piston iittingsai'd cylinder having an Yimper'fo rate 'Y head and ar# ranged with its.4 trunk extending away from the head of'said cylinder, 'awiixed cylinder head fitting withinthe trunk of the piston 'onthe opposite side of lthe imperfoiate;pis-4 ton` head froiiithe iirst cylinderhead, 'and having admissin and exhaust ,means opening into the space within the trunk'pistoifi between the""head' of the latter and "said 'iixed cylinder head, a wrist' vpin mounted' at its'opposite ends in the' pistontri'inkfat the opposite side of lthey second cylinderhead from the'gpis'ton head, tivo connecting rods pivoted 'on said -wrist' pin,a crank shaft; two eccentr'ics mounted on said crank shaft, and

eccentric straps vsurrounding said .eccentrics and oined tosaid connecting reds.

4. A pump comprising a crank case hairing bearings',"a crankshaft mol'inted'in said ler supported on the crank case having' an" inlet and an outlet with ncheck'"valves controlliiigthe saine, a piston fitting said cylinder', va wrist piii carried by the piston', aconnecting rod between said wrist pinand' thef'c'rank of thecrank f shaft said piston Yhaving a trunk, aniiii'ier" cylinder h'ead iitting within the piston trunk and a traine`'supportin`,cq 'said innercylinderA headl comprising side members on,` 'opposite sides of the wrist pin secured to the 4crank case and vJoined to the cylinder head, one

` of 4said sideniei'nbers havinganadmission outer casing havingan outer head, a trunk piston tting slidingly inVV said casing, a"

joined' atene endto said crank, a VwristV pin Vn'iounted at its opposite endsin they side,

-shai'tV having' a "crank, 'a connecting rodf of the piston,

walls-lof the pistontrunlgoined tothe opi passage andthe other having an exhaust passage, opening through the cylinder head to the spacebetween the `lattei` andthe head 5. pump comprising a crank case havingbearings, a crank shaft mounted in said said rpassages 'having'openings external tothe outercylinder@l bearings, an outer cylinder supported on Vthe crank oase having an inlet and an outlet with check valves controlling the same, a piston fitting said cylinder, a wrist pin carried by the piston, a connecting rod between said wristJ pin and the crank of the crank shaft, said piston having a trunk, an inner cylinder head fitting within the piston trunk, and a frame supporting saidinner cylinder head comprising side members on opposite sides of the wrist pin secured to the crank case and joined to the cylinder head, and a cross member overlying the crank shaft and forming an upper bearing for the same, one of said side members having an admission passage and the other having an exhaust passage, opening through the cylinder head to the space between the latter and the head of the piston, said passages having openings external to the outer cylinder.

6. A pump comprising a crank case having bearings, a crank shaft mounted in said bearings, an outer cylinder supported on the crank case having an inlet and an outlet with check valves controlling the same, a piston fitting said cylinder, a wrist pin carried by the piston, a connecting rod between said wrist pin and the crank of the crank shaft, said piston having a trunk, an inner cylinder head fitting within the piston trunk, and a frame supporting said inner cylinder head comprising side members on opposite sides of the wrist pin secured to the crank case and joined to the cylinder head, one of said side members having an admission passage and the other having an exhaust passage, opening through the cylinder head to the space between the latter and the head of the piston, said passages having openings external to the outer cylinder, the outlet from the outer cylinder being continued through the wall of the cylinder and joined into the passage through the second named one of the side frame members of the inner cylinder head.

7. A pump comprising a crank case having bearings, a crank shaft mounted in said bearings, an outer cylinder supported on the crank case having an inlet and an outlet with check valves controlling the same, a piston fitting said cylinder, a wrist pin carried by the piston, a connecting rod between j said wrist pin and the crank of the crank shaft, said piston having a trunk, an inner cylinder head iitting within the piston trunk, and a frame supporting said inner cylinder head comprising side members on `opposite sides of the wrist pin secured to the crank case and joined to the cylinder head,

one of said side members having an admission passage and the other having an exhaust passage, opening through the cylinder head to the space between the latter and the head of the piston, said passages having openings external to the outer cylinder, the outlet from the outer cylinder being continued through the wall of the cylinder and joined into the passage through the second named one of the side frame members of the inner cylinder head and a pipe coupling attached to the common outlet of the two exhaust passages adapted to receive a conduit.

8. A single stage double acting air pump comprising outer and inner concentric cylinders having an annular space between their sidewalls and a space between their heads,'a trunk piston located in such space with its trunk fitting the interior of the outer cylinder and the exterior of the ,inner cylinder, means for reciprocating said piston, inlets opening into the spaces on opposite sides of the piste-n head, outwardly closing check valves for said inlets, separate outlet ports from said spaces, inwardly closing check valves for said outlet ports, and a passage connecting both outlet ports and having aY single external orifice.

9. A single stage double acting air pump comprising outer and inner concentric cylinders arranged with a space between their relatively corresponding heads and with their side walls spaced apart, a trunk piston fitting within the outer cylinder and also fitting outside of the inner cylinder,` having a head located in the space between the two cylinder heads, means for reciprocating said piston, inlets opening into the spaces on opposite sides of the piston heads, outwardly closingcheck valves for said inlets, -separate outlet ports for said spaces, and inwardly closing check valves for said outlet ports.

In testimony whereofl I have affixed my signature, in presence of two witnesses.

PAUL 1 1. DURUP. v Witnesses: I

ARTHUR H. BROWN, P. W. PEZZETTI.

Copies ofvthis patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, '.D. C. 

